// Given a directive and the previous entry, create a new entry.
protected override LineMappingEntry GetEntry(DirectiveTriviaSyntax directiveNode, SourceText sourceText, LineMappingEntry previous)
{
Debug.Assert(ShouldAddDirective(directiveNode));
var directive = (LineDirectiveTriviaSyntax)directiveNode;
// Get line number of NEXT line, hence the +1.
var directiveLineNumber = sourceText.Lines.IndexOf(directive.SpanStart) + 1;
// The default for the current entry does the same thing as the previous entry, except
// resetting hidden.
var unmappedLine = directiveLineNumber;
var mappedLine = previous.MappedLine + directiveLineNumber - previous.UnmappedLine;
var mappedPathOpt = previous.MappedPathOpt;
PositionState state = PositionState.Unmapped;
// Modify the current entry based on the directive.
SyntaxToken lineToken = directive.Line;
if (!lineToken.IsMissing)
{
switch (lineToken.Kind())
{
case SyntaxKind.HiddenKeyword:
state = PositionState.Hidden;
break;
case SyntaxKind.DefaultKeyword:
mappedLine = unmappedLine;
mappedPathOpt = null;
state = PositionState.Unmapped;
break;
case SyntaxKind.NumericLiteralToken:
// skip both the mapped line and the filename if the line number is not valid
if (!lineToken.ContainsDiagnostics)
{
object?value = lineToken.Value;
if (value is int)
{
// convert one-based line number into zero-based line number
mappedLine = ((int)value) - 1;
}
if (directive.File.Kind() == SyntaxKind.StringLiteralToken)
{
mappedPathOpt = (string?)directive.File.Value;
}
state = PositionState.Remapped;
}
break;
}
}
return(new LineMappingEntry(
unmappedLine,
mappedLine,
mappedPathOpt,
state));
}
// Given a directive and the previous entry, create a new entry. protected abstract LineMappingEntry GetEntry(TDirective directive, SourceText sourceText, LineMappingEntry previous);
